A photograph of the flood of the dam which shaped like a gigantic morning glory

The flood discharge (Kuzu Ibuki) is a water discharge facility for when the dam crosses the proper water level, such as during a flood. Generally it seems to be provided in the center part of the dam main body and right and left, but there is a dam with morning glory type flood discharge in the middle of the dam. You can see what kind of thing you see by looking at the picture.

Details are as follows.
A large hole in the water surface.


Exit for water discharge. It's amazing momentum.


Some people use it for playing when water does not come out.


Flying over the hole by airplane.
Flying over Glory Hole - Google Video


The sound that water is drinking is amazing.
YouTube - Gloryholeious


Distant view. It is exposed on the surface of the water because there is little water.


When approaching it is like this.


You can also see it on Google Maps.

Google Maps

This flood is located in the northern part of California, a dam named Monticello Dam. The diameter of the hole is 72 feet in a wide place and about 28 feet in a narrow place. It seems that the distance to the exit is 700 feet (about 213 m). It is said that flooding can drain 1370 cubic meters of water per second.

Many more pictures can be seen from the following links.

Fogonazos: The largest drain hole in the world

The Glory Hole

GLORYHOLIOUS - a photoset on Flickr

Morning Glory Spillway - Davis Wiki